Professor of Planetary Astronomy Mike Brown speaks in front of a computer simulation of the probable orbit of Planet Nine (yellow) at the California Institute of Technology in Pasadena, January 20, 2016. The solar system may host a ninth planet that is about 10 times bigger than Earth and orbiting far beyond Neptune. (reuters)
If Planet Nine is real, it would fill a notable gap in our solar system, they added.
“One of the most startling discoveries about other planetary systems has been that the most common type of planet out there has a mass between that of Earth and that of Neptune,” Batygin said. “Until now, we’ve thought that the solar system was lacking in this most common type of planet. Maybe we’re more normal after all.”
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